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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a4ca5d0795bc6138ef7e844eda7e9c37a5186ac51a51db61a4119bd3189cc48' 
  AND token = 'QSwehxAuYOroiLAhvWy8kxYdQRPQinZJ7P5v32exOH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}